Application

Vacuum pumps for seawater deaeration

Before seawater is injected into oil fields, a deaerator column under vacuum removes the dissolved oxygen from it – according to Edwards against corrosion, according to Busch in the deaerator tower. Atlas Copco also names degassing for carbon capture from seawater under harsh offshore conditions. Below you can see how the application works, what vacuum the manufacturers name and which of their series are intended for it – 175 models from 3 manufacturers.

Compare 175 modelsHow it works

  • 175Models
  • 7Series
  • 3Manufacturers
  • below 50 ppbResidual oxygen, two-stage (Edwards)
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Touch the points: each part of the system explains itself.

In short

Seawater deaeration: the key facts

  • Oxygen removalBusch describes O₂ removal in the deaerator tower under vacuum and the removal of dissolved gases from the flood water; DOLPHIN and COBRA are named.
  • Residual oxygenWith a stripping column, liquid ring vacuum pumps and air ejectors, Edwards names below 50 ppb with a two-stage and below 20 ppb with a three-stage design.
  • Corrosion protectionAccording to Edwards, the oxygen is removed from the injection water to prevent corrosion; LR1A, LR1C and LR1D are named.
  • Offshore and CCUSAtlas Copco names AWS and AWD with a booster for CO₂ removal from seawater under harsh offshore conditions, as well as deaerator systems for seawater deaeration for oil field water injection.
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  • Air and gas (vacuum)
  • Exhaust

Operating principle

How it works: Seawater deaeration

The drawing shows the basic principle in section. The systems and pumps of the individual manufacturers differ in detail.

  1. DeaeratingThe seawater passes through the column under vacuum; dissolved gases such as oxygen escape from the water (Busch: O₂ removal in the deaerator tower).
  2. CondensingThe entrained water vapour is condensed in the condenser and collected in the condensate vessel before the gases reach the pump.
  3. ExtractingThe vacuum pump – liquid ring vacuum pumps with air ejectors according to Edwards, AWS and AWD with a booster according to Atlas Copco – draws off the gases; Edwards names below 50 ppb residual oxygen with two stages and below 20 ppb with three.

Vacuum and sizing

Seawater deaeration: how much vacuum is needed

What the manufacturers say about pressure, pumping speed and sizing.

What vacuum

As the result, Edwards names below 50 ppb residual oxygen with a two-stage and below 20 ppb with a three-stage design.

What determines the design

The number of stages (Edwards: two or three), the combination of stripping column, liquid ring vacuum pump and air ejectors (Edwards) or liquid ring vacuum pump with booster (Atlas Copco: AWS, AWD), and the offshore conditions (Atlas Copco).

What the manufacturers point out

Corrosion caused by oxygen in the injection water (Edwards), harsh offshore conditions (Atlas Copco) and the removal of dissolved gases from the flood water (Busch: DOLPHIN, in its product finder also COBRA).

Technology

Seawater deaeration: the vacuum pumps the manufacturers name

Listed are the series the manufacturer itself names for this application. “Show only …” sets the filter of the product overview.

Product overview

Seawater deaeration: all 175 models compared

Use the filters on the left to narrow the selection – by manufacturer, technology and the models’ key figures, for 50 or 60 Hz.

Atlas Copco AWD series 14 models

AWD 110 SPumping speed 106 m³/h 50 Hz128 m³/h 60 HzUltimate pressure 33 mbarRated motor power 3 kW 50 Hz3.7 kW 60 HzVariants 3
AWD 140 SPumping speed 145 m³/h 50 Hz174 m³/h 60 HzUltimate pressure 33 mbarRated motor power 4 kW 50 Hz5.5 kW 60 HzVariants 3
AWD 180 SPumping speed 186 m³/h 50 Hz223 m³/h 60 HzUltimate pressure 33 mbarRated motor power 5.5 kW 50 Hz7.5 kW 60 HzVariants 3
AWD 300 SPumping speed 270 m³/h 50 Hz314 m³/h 60 HzUltimate pressure 33 mbarRated motor power 7.5 kW 50 Hz11 kW 60 HzVariants 3
AWD 350 SPumping speed 342 m³/h 50 Hz411 m³/h 60 HzUltimate pressure 33 mbarRated motor power 11 kW 50 Hz15 kW 60 HzVariants 3
AWD 400 SPumping speed 425 m³/h 50 Hz475 m³/h 60 HzUltimate pressure 33 mbarRated motor power 15 kW 50 Hz18.5 kW 60 HzVariants 3
AWD 500 SPumping speed 501 m³/h 50 Hz590 m³/h 60 HzUltimate pressure 33 mbarRated motor power 18.5 kW 50 Hz22 kW 60 HzVariants 3
AWD 600 SPumping speed 616 m³/h 50 Hz739 m³/h 60 HzUltimate pressure 33 mbarRated motor power 20 kW 50 Hz30 kW 60 HzVariants 3
AWD 800 SPumping speed 862 m³/h 50 Hz1,032 m³/h 60 HzUltimate pressure 33 mbarRated motor power 30 kW 50 Hz37 kW 60 HzVariants 3
AWD 1200 SPumping speed 1,252 m³/h 50 Hz1,407 m³/h 60 HzUltimate pressure 33 mbarRated motor power 37 kW 50 Hz45 kW 60 HzVariants 3
AWD 1600 SPumping speed 1,589 m³/h 50 Hz1,717 m³/h 60 HzUltimate pressure 33 mbarRated motor power 45 kW 50 Hz75 kW 60 HzVariants 3
AWD 1960Pumping speed 2,000 m³/h 50 HzUltimate pressure 33 mbarRated motor power 75 kW 50 HzVariants 3
AWD 3280Pumping speed 3,300 m³/h 50 HzUltimate pressure 33 mbarRated motor power 110 kW 50 HzVariants 3
AWD 4510Pumping speed 4,500 m³/h 50 HzUltimate pressure 33 mbarRated motor power 132 kW 50 HzVariants 3

Atlas Copco AWS series 22 models

AWS 180Pumping speed 168 m³/h 50 Hz202 m³/h 60 HzUltimate pressure 33 mbarRated motor power 5.5 kW 50 Hz7.5 kW 60 HzVariants 6
AWS 280Pumping speed 246 m³/h 50 Hz290 m³/h 60 HzUltimate pressure 33 mbarRated motor power 7.5 kW 50 Hz11 kW 60 HzVariants 6
AWS 360Pumping speed 340 m³/h 50 Hz412 m³/h 60 HzUltimate pressure 33 mbarRated motor power 11 kW 50 Hz15 kW 60 HzVariants 6
AWS 450Pumping speed 450 m³/h 50 Hz535 m³/h 60 HzUltimate pressure 33 mbarRated motor power 15 kW 50 Hz22 kW 60 HzVariants 8
AWS 600Pumping speed 600 m³/h 50 Hz700 m³/h 60 HzUltimate pressure 33 mbarRated motor power 18.5 kW 50 Hz30 kW 60 HzVariants 8
AWS 800Pumping speed 750 m³/h 50 Hz888 m³/h 60 HzUltimate pressure 33 mbarRated motor power 22 kW 50 Hz30 kW 60 HzVariants 8
AWS 1100Pumping speed 1,080 m³/h 50 Hz1,320 m³/h 60 HzUltimate pressure 33 mbarRated motor power 37 kW 50 Hz45 kW 60 HzVariants 8
AWS 1300Pumping speed 1,230 m³/h 50 Hz1,452 m³/h 60 HzUltimate pressure 33 mbarRated motor power 37 kW 50 Hz55 kW 60 HzVariants 8
AWS 1600Pumping speed 1,700 m³/h 50 Hz2,000 m³/h 60 HzUltimate pressure 33 mbarRated motor power 45 kW 50 Hz75 kW 60 HzVariants 8
AWS 2500Pumping speed 2,450 m³/h 50 Hz2,780 m³/h 60 HzUltimate pressure 33 mbarRated motor power 75 kW 50 Hz90 kW 60 HzVariants 8

Busch COBRA Industry series 36 models

Busch DOLPHIN series 70 models

Edwards LR1A series 12 models

Edwards LR1C series 9 models

Edwards LR1D series 12 models

Model comparison

Models a manufacturer no longer carries in its current range are listed in its “Outdated models” section.

Industries

Seawater deaeration: where the manufacturers name it

The manufacturers list these uses on their own pages.

Oil and gas

Busch names seawater degassing and deaeration for flood water with DOLPHIN and COBRA, Edwards the removal of oxygen from injection water against corrosion with LR1A, LR1C and LR1D.

Industry page: Oil and gas →

Carbon capture (CCUS)

Atlas Copco names AWS and AWD with a booster for the removal of CO₂ from seawater under harsh offshore conditions.

Industry page: Carbon capture (CCUS) →

Frequently asked questions

Seawater deaeration: frequently asked questions

How does seawater deaeration work?

The seawater passes through a column under vacuum and releases its dissolved gases – Busch describes O₂ removal in the deaerator tower, Edwards a stripping column with two or three stages. The water vapour is condensed, and the vacuum pump draws off the gases.

Why must seawater be deaerated before injection?

According to Edwards, the oxygen is removed from the injection water to prevent corrosion. Busch describes the removal of dissolved gases from the flood water, Atlas Copco seawater deaeration for oil field water injection.

Which vacuum pump for seawater deaeration?

Edwards names the liquid ring series LR1A, LR1C and LR1D together with a stripping column and air ejectors. Atlas Copco names AWS and AWD with a booster for offshore conditions, Busch DOLPHIN and COBRA.

How much residual oxygen remains after vacuum deaeration?

Edwards names below 50 ppb with a two-stage and below 20 ppb with a three-stage design of the stripping column.

How much vacuum does seawater deaeration need?

According to Edwards, the design depends on the required residual oxygen: two stages for below 50 ppb, three stages for below 20 ppb.

Liquid ring or dry vacuum pump for seawater?

Edwards and Atlas Copco name liquid ring vacuum pumps: Edwards LR1A, LR1C and LR1D with air ejectors, Atlas Copco AWS and AWD with a booster. Busch names DOLPHIN and, in its product finder, COBRA.

What role do air ejectors play in seawater deaeration?

Edwards describes the system as a combination of stripping column, liquid ring vacuum pump and air ejectors; the ejectors work upstream of the pump. Atlas Copco names boosters upstream of AWS and AWD instead.

Can vacuum be used to remove CO₂ from seawater?

Atlas Copco names seawater degassing in connection with carbon capture (CCUS): CO₂ is removed from the seawater under harsh offshore conditions; AWS and AWD with a booster are named.

A single pump or a central vacuum system?

A central system in a room of its own keeps noise and heat away from production and matches its output to the demand. Central vacuum systems are planned and built by Eugen Theis Vakuum, a company of the Ehrler & Beck group – more under Central Vacuum.

Does Ehrler & Beck also supply spare parts and service?

Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.

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